U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 5 Station ID: 8729851 PUBLICATION DATE: 07/26/2004 Name: CHEMSTRAND PIER FL NOAA Chart: 11382 Latitude: 30° 35.9' N ( 30.59830) USGS Quad: PACE Longitude: 87° 14.8' W ( -87.24670) To reach the tidal bench marks from the intersection of U.S. Alt. Highway 90 and U.S. Highway 29 north of Pensacola, proceed north on U.S. Highway 29 for 5.3 km (3.3 mi) to County Road C-749 (Chemstrand Road), then turn right and proceed NE on County Road C-749 for 3.9 km (2.4 mi) to the Monsanto Company Plant. The bench marks are inside the plant property and along the entrance road. The tide gage and staff were located on the NE corner of the Monsanto Company dock at the Escambia River. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 9851 C ELEV. 36.490 E5950.00 N13400.00 DESIGNATION: 872 9851 C TIDAL MONUMENTATION: Not specified (see descriptive text) VM#: 10278 AGENCY: Monsanto Corporation IDB PID#: BG4582 SETTING CLASSIFICATION: Concrete monument OPUS PID: LATITUDE: 30° 36.0' N ( 30.60000) LONGITUDE: 87° 15.0' W ( -87.25000) The primary bench mark is a brass disk set in the top of a concrete monument in a secured area of the plant, surrounded by a 1.1 m (3.5 ft) high, 2 m (6 ft) diameter circular pipe barricade, 20.88 m (68.5 ft) east of the intersection of Central Avenue and H Street, 13.26 m (43.5 ft) SE of power line pole #135, 10.82 m (35.5 ft) WSW of an overhead pipeline support, 8.90 m (29.2 ft) west of fire control valve #S36, and 0.2 m (0.8 ft) above ground level.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 5 Station ID: 8729851 PUBLICATION DATE: 07/26/2004 Name: CHEMSTRAND PIER FL NOAA Chart: 11382 Latitude: 30° 35.9' N ( 30.59830) USGS Quad: PACE Longitude: 87° 14.8' W ( -87.24670) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 9851 D ELEV. 38.414 E5530.0 N1 DESIGNATION: 872 9851 D TIDAL MONUMENTATION: Not specified (see descriptive text) VM#: 10279 AGENCY: Monsanto Corporation IDB PID#: BG4581 SETTING CLASSIFICATION: Concrete monument OPUS PID: LATITUDE: 30° 35.9' N ( 30.59830) LONGITUDE: 87° 15.0' W ( -87.25000) The bench mark is a brass disk set in the top of a concrete monument in a secured area of the plant, surrounded by a 1 m (3.5 ft) high, 2 m (6 ft) diameter circular pipe barricade painted with red and white stripes, 145.21 m (476.4 ft) SE of bench mark 9851 E E.5530 N13400 ELEV.39.016, 22.56 m (74.0 ft) east of the intersection of G Street South and a paved cross street, 16.98 m (55.7 ft) SE of fire control valve #S28, and 10.36 m (34.0 ft) SE of fire control valve #S93, and at ground level. BENCH MARK STAMPING: 9851 E E.5530 N13400 ELEV. 39.016 DESIGNATION: 872 9851 E TIDAL MONUMENTATION: Not specified (see descriptive text) VM#: 10280 AGENCY: Monsanto Corporation IDB PID#: BG4580 SETTING CLASSIFICATION: Concrete monument OPUS PID: LATITUDE: 30° 35.9' N ( 30.59830) LONGITUDE: 87° 15.0' W ( -87.25000) The bench mark is a brass disk set in the top of a concrete monument in a secured area of the plant, surrounded by a 2 m (6 ft) diameter white circular pipe barricade, 0.6 km (0.4 mi) NE of the security gate, 20.33 m (66.7 ft) NE of centerline of G Street South, 10.36 m (34.0 ft) SE of fire control valve #S32, 10.36 m (34.0 ft) SE of the east corner of red brick building and 0.15 m (0.5 ft) below ground level.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 5 Station ID: 8729851 PUBLICATION DATE: 07/26/2004 Name: CHEMSTRAND PIER FL NOAA Chart: 11382 Latitude: 30° 35.9' N ( 30.59830) USGS Quad: PACE Longitude: 87° 14.8' W ( -87.24670) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 9851 F 1985 DESIGNATION: 872 9851 F TIDAL MONUMENTATION: Tidal Station disk VM#: 17268 AGENCY: National Ocean Service (NOS) IDB PID#: BG4579 SETTING CLASSIFICATION: Concrete base OPUS PID: LATITUDE: 30° 35.7' N ( 30.59500) LONGITUDE: 87° 15.4' W ( -87.25670) The bench mark is a disk set in the concrete base for the flagpole in the center of a 30 m (100 ft) diameter traffic island, 0.6 km (0.4 mi) NE of the entrance to the Monsanto property, and 0.30 m (1 ft) SE of the flagpole. BENCH MARK STAMPING: 9851 G 1985 DESIGNATION: 872 9851 G TIDAL MONUMENTATION: Tidal Station disk VM#: 17269 AGENCY: National Ocean Service (NOS) IDB PID#: BG4578 SETTING CLASSIFICATION: Culvert head wall OPUS PID#: BG4578 LATITUDE: 30° 35.4' N ( 30.59000) LONGITUDE: 87° 15.7' W ( -87.26170) The bench mark is a disk set in the top of a concrete culvert head wall at the entrance to the Monsanto property, 18.90 m (62.0 ft) SE of the centerline of the east-west entrance road, 17.83 m (58.5 ft) NE of and across the north-south road from a light pole, 5.18 m (17.0 ft) east of the centerline of the north-south entrance road, 0.3 m (1 ft) north of the south end of the head wall, and 0.3 m (1 ft) below road level.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 5 Station ID: 8729851 PUBLICATION DATE: 07/26/2004 Name: CHEMSTRAND PIER FL NOAA Chart: 11382 Latitude: 30° 35.9' N ( 30.59830) USGS Quad: PACE Longitude: 87° 14.8' W ( -87.24670) T I D A L D A T U M S Tidal datums at CHEMSTRAND PIER based on: LENGTH OF SERIES: 2 MONTHS TIME PERIOD: June 1977 - July 1977 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 8729840 PENSACOLA, PENSACOLA BAY Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: MEAN HIGHER HIGH WATER MHHW = 0.445 MEAN HIGH WATER MHW = 0.422 MEAN TIDE LEVEL MTL = 0.223 MEAN SEA LEVEL MSL = 0.223 North American Vertical Datum NAVD88 = 0.082 MEAN LOW WATER MLW = 0.024 MEAN LOWER LOW WATER MLLW = 0.000 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 9851 C ELEV. 36.490 E5950.00 N13400.00 11.146 10.724 9851 D ELEV. 38.414 E5530.0 N1 11.727 11.305 9851 E E.5530 N13400 ELEV. 39.016 11.912 11.490 9851 F 1985 16.719 16.297 9851 G 1985 26.591 26.169
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 5 Station ID: 8729851 PUBLICATION DATE: 07/26/2004 Name: CHEMSTRAND PIER FL NOAA Chart: 11382 Latitude: 30° 35.9' N ( 30.59830) USGS Quad: PACE Longitude: 87° 14.8' W ( -87.24670) D E F I N I T I O N S Mean Sea Level (MSL) is a tidal datum determined over a 19-year National Tidal Datum Epoch. It pertains to local mean sea level and should not be confused with the fixed datums of North American Vertical Datum of 1988 (NAVD88). NAVD88 is a fixed datum derived from a simultaneous, least squares, minimum constraint adjustment of Canadian/Mexican/United States leveling observations. Local mean sea level observed at Father Point/Rimouski, Canada was held fixed as the single initial constraint. NAVD88 replaces NGVD29 as the national standard geodetic reference for heights. Bench mark elevations relative to NAVD88 are available from NGS through the World Wide Web at National Geodetic Survey. NGVD29 is a fixed datum adopted as a national standard geodetic reference for heights but is now considered superseded. NGVD29 is sometimes referred to as Sea Level Datum of 1929 or as Mean Sea Level on some early issues of Geological Survey Topographic Quads. NGVD29 was originally derived from a general adjustment of the first-order leveling networks of the U.S. and Canada after holding mean sea level observed at 26 long term tide stations as fixed. Numerous local and wide-spread adjustments have been made since establishment in 1929. Bench mark elevations relative to NGVD29 are available from the National Geodetic Survey (NGS) data base via the World Wide Web at National Geodetic Survey. NAVD88 and NGVD29 are fixed geodetic datums whose elevation relationships to local MSL and other tidal datums may not be consistent from one location to another. The Vertical Mark Number (VM#) and PID# shown on the bench mark sheet are unique identifiers for bench marks in the tidal and geodetic databases, respectively. Each bench mark in either database has a single, unique VM# and/or PID# assigned. Where both VM# and PID# are indicated, both tidal and geodetic elevations are available for the bench mark listed. The NGS's Integrated Data Base (IDB PID) provides geodetic datum based on traditionally leveled and bluebooked ties to the National Spatial Reference System(NSRS) https://www.ngs.noaa.gov/datasheets/. The NGS Online Positioning User Service (OPUS PID) provides geodetic datum based on GPS position & tie it to the NSRS https://www.ngs.noaa.gov/OPUS/. The NAVD88 elevation is shown on the Elevations of Tidal Datums Table Referred to MLLW only when two or more of the bench marks listed have NAVD88 elevations. The NAVD88 elevation relationship shown in the table is derived from an average of several bench mark elevations relative to tide station datum. As a result of this averaging, NAVD88 bench mark elevations computed indirectly from the tidal datums elevation table may differ slightly from NAVD88 elevations listed for each bench mark in the NGS database.